The Outer Court covers a large space between the Meridian Gate and the Gate of Heavenly purity.
外殿包括了从午门到乾清门之间的大片空地。
2
Meridian These are similar to UTM zones. Both apply to large areas based on a line of longitude, both are often left out of field data, and the position is not uniquely defined without them!
The advantage and application of double direction meridian line net shell structure of fixed roof for large diameter storage tank are introduced emphatically.